TABLE 1.

Estimated Effects of Age, Family Status, Sex, and Geographical Area on the Number of All Reported Contacts

Parameter	Level	N	Mean (SD)	Effect (95% CI)
Age (yrs)	18–29	184	2.7 (2.3)	◊
	30–39	158	2.6 (2.5)	0.89 (0.73, 1.1)
	40–49	168	3.1 (3.6)	0.99 (0.82, 1.2)
	50–59	209	2.7 (3.0)	0.95 (0.79, 1.1)
	60–69	238	2.0 (2.0)	0.80 (0.67, 0.96)
	70–79	218	1.4 (1.4)	0.57 (0.46, 0.69)
Children	No	978	2.0 (2.3)	◊
	Yes	197	4.0 (3.1)	1.7 (1.5, 2.0)
Sex	Female	591	2.5 (2.6)	◊
	Male	584	2.2 (2.5)	0.98 (0.88, 1.1)
Region	Helsinki–Uusimaa	323	2.2 (2.3)	◊
	Rest	852	2.4 (2.7)	1.1 (1.0, 1.3)
Age (yrs)	0–4	23	4.0 (2.7)	*
	5–9	23	3.6 (2.2)	0.90 (0.66, 1.2)
	10–14	46	3.3 (1.7)	0.81 (0.62, 1.1)
	15–17	53	3.5 (1.8)	0.87 (0.67, 1.1)

The relative numbers with respect to the reference class (i.e., effects) are based on a negative binomial regression model. In the 1,175 adults with a total of 2,777 contacts, the reference class (◊) is females without children in the youngest age class (18–29 years) outside the Helsinki–Uusimaa region, with the point estimate of 2.2 contacts per day (95% CI = 1.9, 2.6). The data from the 145 children with 511 contacts were analyzed separately. The reference class (*) is the youngest age class with 4.0 contacts per day (95% CI = 3.1, 5.2).

CI indicates credible interval.